in soil organic matter dynamics

... soil varies con- siderably in depth, clay contents increasing with depth and is classified as Humic Acrisol [12] These and other soil characteristics are indicated in table III pine trees (Pinus ... + indeterminate organs) are indicated in table VII Leaf litter production was very similar in both forests while litter production was more important in the pine forest The differences appearing ... S.P., Bingham F.T., Comparative study of decomposition rates of organic matter in temperate and tropical regions, Soil Sci 68 (1949) 419-432 [20] Joergensen R.G., Organic matter and nutrient dynamics...

Ngày tải lên: 08/08/2014, 14:21

... dynamic, varying in individual soils with the pattern, intensity inputs, and disturbance The quantity and character of organic residues © 2004 by CRC Press LLC 80 Soil Organic Matter in Sustainable ... aluminum in stabilizing organic matter in particle size fractions of Chermozemic and Solonetzic soils Can J Soil Sci 82, 265–268 Curtin, D., and G Wen (1999) Organic matter fractions contributing ... evidence for condensed domains in soil organic matter Soil Sci 164, 40–47 Xing, B., and J.J Pignatello (1996) Time-dependent isotherm shape of organic compounds in soil organic matter: Implications...

Ngày tải lên: 12/08/2014, 05:21

... 1979) In another experiment in which increasing amounts of suppressive litter was added to a conducive lateritic field soil, hyphal lysis occurred within 24 h in soils containing 50% or more organic ... PM 138 Soil Organic Matter in Sustainable Agriculture involved the exploitation of the indigenous soil microflora, which to me have been much neglected in favor of intensive research on individual ... and organic matter decomposition in soils amended with de-inking paper sludge Soil Sci Soc Am J 63:1214–1221 Chef, D.G., H.A.J Hoitink, and L.V Madden 1983 Effect of organic components in container...

Ngày tải lên: 12/08/2014, 05:21

... 11:19 AM 180 Soil Organic Matter in Sustainable Agriculture ESTIMATING FUNGAL BIOMASS Microbial biomass is often used as an indicator of the microbial contribution to soil organic matter, plant ... data) In the soil, organic matter, metals (such as iron), clays, and other substances might bind to glomalin, causing conformational changes or masking the reactive site and thereby interfering ... AM 188 Soil Organic Matter in Sustainable Agriculture HA 3.99 FA 1.70 Humin 10.88 POM 3.40 A HA 1.68 Humin 8.15 Glomalin 5.52 FA 1.70 POM 2.92 B FIGURE 6.4 The major fractions of soil organic...

Ngày tải lên: 12/08/2014, 05:21

... wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Barley – grain Barley ... (1996) Soil Organic Matter in Sustainable Agriculture Crop/Component Spr wheat – grain Spr wheat – grain Spr wheat – grain Spr wheat – grain Spr wheat – grain Win wheat – grain Win wheat – grain Win ... for soil organic matter dynamics Crop residues are rich in organic C and N, and therefore their removal is a loss of input to the soil, resulting almost always in a decline in soil organic matter...

Ngày tải lên: 12/08/2014, 05:21

... legume residues in legume-corn rotations Agron J 79:726–731 Hodges, R D 1991 Soil organic matter: its central position in organic farming In Wilson, W S (Ed.), Advances in Soil Organic Matter Research: ... Modeling soil organic matter in organic- amended and nitrogen fertilized long-term plots Soil Sci Soc Am J 56:476–488 Pia, J F 1998 CIESA Project: Biointensive mini-farming in Patagonia In Foguelman, ... of the initial total N mineralizes in the first year, 9% of the N remaining after the first year mineralizes in the second year, and 3% of N remaining after the second year mineralizes in the third...

Ngày tải lên: 12/08/2014, 05:21

... a cementing agent for holding soil particles together SOM can be maintained or increased by incorporating crop residues, crop rotation, cover crops, permanent plantings, maintaining soil fertility, ... LLC 312 Soil Organic Matter in Sustainable Agriculture Dryland farming begins ORGANIC MATTER (%) Long-term experiment begins 1881 Soil Amendments - 22 t Manure ha−1, No Burn - 2.2 t Pea Vines ha−1, ... 296 Soil Organic Matter in Sustainable Agriculture Soil Quality Soil quality is defined as the capacity of a soil to function within ecosystem boundaries to sustain biological productivity, maintain...

Ngày tải lên: 12/08/2014, 05:21

... PM 328 Soil Organic Matter in Sustainable Agriculture INTRODUCTION The importance of soil biota in soil pedogenesis and in maintaining soil structure, organic matter breakdown, recycling of nutrients, ... much higher than in bulk soil, with ammonium and nitrates usually being the dominant forms of inorganic N in the casts (Lavelle and Martin, 1992) Overall increases in inorganic N in earthworm casts ... of organic matter in soil remain unknown Another way in which earthworms might affect the microbial decomposition of soil organic matter is by in uencing the ratio of fungi to bacteria in the soil...

Ngày tải lên: 12/08/2014, 05:21

... content of soils may range from less than 0.1% in desert soils to close to 100.0% in organic soils In inorganic soils, organic and inorganic components are so closely associated that it is necessary ... SOILS O F ARID REGIONS H AUBERT and M PINTA TRACE ELEMENTS IN SOILS Developments in Soil Science SOIL ORGANIC MATTER Edited by M SCHNITZER Soil Research Institute Agr ic u t u re Canada Ottawa, ... PREFACE Soil organic matter, a key component of soils, affects many reactions that occur in these systems In spite of this, soil organic matter remains a neglected field in soil science and receives...

Ngày tải lên: 30/05/2014, 22:57

Ngày tải lên: 14/11/2014, 06:07

... The incorporation of logging residues into the mineral soil implied higher rates of soil biological processes, which resulted in increased organic matter decomposition and in changes of N dynamics ... harvesting and slash management on mineralization of soil organic matter in a forest soil intensively managed In a previous paper [28], nutrient export by tree removal and nutrient dynamics in decaying ... logging residues can be managed so that soil organic matter is retained in these systems and long-term soil nutrient supply rates are maintained The main objective of this research was to examine...

Ngày tải lên: 08/08/2014, 14:21

... and X are the masses remaining at time t and time zero, respectively [61] The organic matter 305 Organic matter and nitrogen dynamics in a beech forest remaining on the soil was calculated immediately ... IR index was found at the beginning of autumn and the lowest in spring Accordingly, the periods showing the highest percentages of N may be intimately correlated with those in which leaf shedding ... contrasted with that obtained for the same date from leaves that fell during shedding: 0.68%, the contents in the leaves decreasing in favour of an increase in nitrogen in branches and bark for...

Ngày tải lên: 08/08/2014, 14:21

... ion ion tion New tion ba ba bat bat incu incu incu incu 1st 2nd 3rd 4th Figure Change in amount of organic carbon on PAC for every incubation by glucose According to Sutherland (2001), extracellular ... rpm, 20 minutes) to determine was determined as the amount of biofilm developed on PAC The amount of organic carbon in washing solution The adsorption capacity of the separated PAC from washing solution ... PAC in the aeration tank, and PAC after 1st and 4th incubation The adsorption capacity of PAC decreased with incubation time In other word, the adsorption capacity of PAC increased with increase...

Ngày tải lên: 05/09/2013, 08:40

... mechanical straining as well Organic matter causes chemical leaching of arsenic in AIRU The leaching of arsenic and iron in the presence of organic matter in AIRU feed water was investigated under ... with high organic contamination is even used in drinking water treatment in the rural areas of Bangladesh Moreover, the concentration of organic matter is sometimes unnoticed in the installation ... MATERIALS AND METHODS Field study Preliminary minor-scale field inspection was made in Bangladesh to presume the level of organic matter contaminations in the existing arsenic and iron removal units...

Ngày tải lên: 05/09/2013, 09:38

... DOM in the original river water sample seems to fit into two linear portions indicating two classes of binding sites In contrast, DOMs in the samples after and weeks fitted to a single line, ... of zinc binding sites in river water DOM Fig represents the variation of DOC, UV254 and SUVA during the river water incubation for weeks in the preliminary study During the first days of incubation, ... slopes of the lines in a particular binding site class Conditional stability constant for the strong type of binding site remained at log K1' = 7.2 while that in weak type remained at log K2'...

Ngày tải lên: 05/09/2013, 10:15

... possible pathways to increase DOM in the lake are as follows: (1) increase in the DOM loading from the watershed, (2) increase in internal production of DOM, (3) decrease in DOM discharge from ... No.2, 2011 in comparison with that in 1985 However, as the particle retention diameter of filter used for separating dissolved matter and particulate matter in 1985 was larger than in 1999 in Takahashi's ... northern basin of Lake Biwa Consequently, DOM in 2000s was expected to be 1.6 times higher than that in 1980s Since the ratio of CODMn observed in 2000s to that in 1980s in the northern basin of Lake...

Ngày tải lên: 05/09/2013, 10:17

... The linear decreasing OM distribution to the increasing vertical and horizontal flow direction is confirmed as the hypothesis in highly deposition of suspended solids and organic matters in the ... OM - organic matters in present (%); - weight of cup (gr); Mc Ms - weight of dried sand sample (gr) by drying at 110 °C in hours; Msc - weight of sand and cup after combusting at 550 °C in hours ... ================================================================================ Soil organic matter (OM) is the organic fraction of soil, including wastewater pollutants, plant roots, animal and plant residues, and microbial biomass OM influences the chemical...

Ngày tải lên: 24/01/2014, 00:20

... Testing Soil organic matter tests are useful in establishing SOM’s influence on soil properties and determining fertilizer or organic matter application needs In sampling for SOM, the top 6-inch ... CO Slow SOM Passive SOM Figure Organic matter cycle (modified from Brady and Weil, 1999) Soil Organic Matter Organic Matter Cycling Soil organic matter (SOM) is defined as the summation of plant ... oxidized by soil microbes, producing H+ ions Organic matter mineralization results in the formation of organic and inorganic acids that also provide H+ to the soil However, the acidifying effects...

Ngày tải lên: 05/03/2014, 21:20

... VOC concentrations in soil and other solid matrices include the following: Samples should be handled as intact soil cores until being transferred into methanol or into the container that will be ... Volatile Organic Compounds in Soil Subsamples US Army Cold Regions Research and Engineering Laboratory, Special Report 95-5 Hewitt, A.D and J.E Lukash (1996) Obtaining and Transferring Soils for In- Vial ... for decision making (e.g., in excavated soils and when determining disposal or treatment options, or for determining concentrations of VOCs that have a high affinity for the soil matrix) 7.0...

Ngày tải lên: 14/03/2014, 20:20

... Biodegradation; Dissolved organic matter; DOC Introduction In the past 10 years, much progress has been made in the understanding of dissolved organic matter (DOM) functions and dynamics in soils Today, it ... degradation of organic matter by microorganisms, then DOM should play a key role in the stabilisation and destabilisation of soil organic matter, and thus, in C dynamics and C pools of soils Sollins et ... organic carbon in air-dried and field-moist soils Soil Biol Biochem 20, 737 – 741 Blaser, P., 1994 The role of natural organic matter in the dynamics of metals in forest soils In: Senesi, N.,...

Ngày tải lên: 15/03/2014, 23:22